Composite lubricating grease and preparation method thereof
A technology of lubricating grease and lubricating base oil, which is applied in the field of materials and lubricating materials, can solve problems such as hindering the practical application of nanoparticles, strong toxicity of inorganic nanoparticles, and easy agglomeration and sedimentation, so as to achieve obvious friction reduction and anti-wear, and improve Effect of extreme pressure antiwear performance and lubricating performance, excellent extreme pressure antiwear performance and lubricating performance
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preparation example Construction
[0034] Preferably, the preparation method of the composite grease comprises the following steps:
[0035] 1) Purify cotton linters, sea squirts or straw with dilute alkali to remove lignin and hemicellulose impurities, wash to neutrality and then dry to obtain purified cellulose; hydrolyze cellulose with hydrochloric acid to precipitate highly crystalline cellulose nanocrystals; after centrifugal washing, dialysis treatment, etc., the purified cellulose nanocrystal suspension is obtained;
[0036] 2) Transfer and disperse the obtained cellulose nanocrystals in N,N-dimethylformamide (DMF), add a surface modifier after ultrasonic dispersion and stabilization, add triethylamine as a catalyst, lithium chloride as a desiccant, 4- Dimethylaminopyridine is used as the activator (DMAP), and the surface modification reaction is carried out under the protection of nitrogen; the product is subjected to centrifugal purification and oven drying to obtain modified cellulose nanocrystals gra...
Embodiment 1
[0045] 1) Stir 25 g of cotton with 1000 ml of 2% mass fraction of sodium hydroxide solution for 12 hours at room temperature, wash with water until neutral, and obtain lignin-removed cotton linters;
[0046] 2) At 80°C, mix 20g of cotton linters with 700ml of 4mol / L hydrochloric acid and stir mechanically for 5h;
[0047] 3) The suspension prepared in step 2 was centrifuged at 5000 rpm for 5 min and washed with water for three times.
[0048] 4) Dialyzing the suspension prepared in step 3 for 5 days, adding DMF to prepare a cellulose nanocrystal suspension.
[0049] 5) At 80°C, mix 20ml of the above-mentioned cellulose nanocrystal suspension, 6.5ml of stearyl chloride, 2.5ml of triethylamine, 100ml of DMF, 0.153g of lithium chloride, and 0.1g of DMAP (4-dimethylaminopyridine) Sonicate for 10min, then magnetically stir for 24h;
[0050] 6) filter the suspension prepared in step 5, then wash with DMF and acetone for 2 times, then add a small amount of acetone to disperse and c...
Embodiment 2
[0062] The present embodiment is different from Example 1 in that: the surface modifier adopted in step (5) is 5ml polyethylene glycol diglycidyl ether, the base oil adopted in step (8) is castor oil, and other steps, reagents and parameters are the same as Embodiment 1 is the same. The consistency of the compound lubricating grease prepared in this example is verified by the cone penetration, the extreme pressure performance is verified by the extreme pressure performance experiment, the friction performance is verified by the four-ball anti-wear test, and the rheological performance is verified by the rheological characteristic curve.
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