Grease, mechanical component, and method for producing grease
AssigneeIdemitsu Kosan Co., Ltd.
InventorsYusuke Nakanishi, Hiromu Kumagai
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Abstract
Provided is a grease containing a base oil and a hydrophilic nanofiber, the hydrophilic nanofiber having a thickness (d) of 0.01 to 500 nm being dispersed therein. The grease is low in an environmental load and excellent in safety on the human body and also has an appropriate worked penetration and has a high dropping point, and therefore, it is also excellent in heat resistance.
Claims11
A grease, comprising a base oil and a hydrophilic nanofiber, the hydrophilic nanofiber having a thickness (d) of 0.01 to 500 nm being dispersed therein,
- wherein:
- an aspect ratio of the hydrophilic nanofiber is 100 or more;
- and
- the hydrophilic nanofiber comprises at least one polysaccharide selected from the group consisting of cellulose, carboxymethyl cellulose, chitin, and chitosan;
- and
- wherein the hydrophilic nanofiber is a surface-modified nanofiber, the modification treatment is selected from the group consisting of esterification, phosphorylation, urethanization, carbamidation, etherification, carboxymethylation, TEMPO oxidation, and periodate oxidation.
A grease obtained by mixing a hydrophilic nanofiber having a thickness (d′) of 0.01 to 500 nm and a base oil, wherein:
- an aspect ratio of the hydrophilic nanofiber is 100 or more;
- and
- the hydrophilic nanofiber comprises at least one polysaccharide selected from the group consisting of cellulose, carboxymethyl cellulose, chitin, and chitosan;
- and
- wherein the hydrophilic nanofiber is a surface-modified nanofiber, the modification treatment is selected from the group consisting of esterification, phosphorylation, urethanization, carbamidation, etherification, carboxymethylation, TEMPO oxidation, and periodate oxidation.
A method for producing a grease, the method comprising:
- dispersing a hydrophilic nanofiber having a thickness (d′) of 0.01 to 500 nm in an aqueous medium to obtain an aqueous dispersion in which the hydrophilic nanofiber is dispersed;
- mixing the aqueous dispersion with a base oil and a dispersion solvent to prepare a mixed solution;
- and
- optionally removing water from the mixed solution,
- to obtain a grease in which the hydrophilic nanofiber has a thickness (d) of 0.01 to 500 nm,
- wherein:
- an aspect ratio of the hydrophilic nanofiber in the grease is 100 or more;
- and
- the hydrophilic nanofiber comprises at least one polysaccharide selected from the group consisting of cellulose, carboxymethyl cellulose, chitin, and chitosan, wherein the hydrophilic nanofiber is a surface-modified nanofiber, the modification treatment is selected from the group consisting of esterification, phosphorylation, urethanization, carbamidation, etherification, carboxymethylation, TEMPO oxidation, and periodate oxidation.
Dependencies are inferred from the claim text.