Polyurea lubricating grease and preparation method thereof
A technology of polyurea grease and polyurea, applied in the field of grease, can solve the problems of related research without graphene application, affecting the oxidation stability of polyurea grease, complicated preparation process, etc., so as to achieve shortened saponification time and good colloid Stability, and the effect of increasing the speed of fat formation
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[0067] In the second aspect, the present invention provides a method for preparing polyurea grease as described above, the method comprising: uniformly mixing graphene, polyurea compound and part of base oil, refining at a constant temperature of 180-230°C, cooling, adding The remaining base oil is added with necessary additives to obtain the finished product.
[0068] In the present invention, the graphene, polyurea compound and base oil are as described above, and will not be repeated here.
[0069] It should be understood by those skilled in the art that the sum of the amount of part of base oil and the amount of balance base oil is the total amount of base oil used. In the present invention, the weight ratio of part of base oil and balance base oil is preferably 1: 0.1-0.5.
[0070] In a third aspect, the present invention provides a polyurea compound that is a method for preparing polyurea grease of dipolyurea, the method comprising:
[0071] (1) Mix and heat part of gr...
Embodiment 1
[0108] Preparation of graphene oxide: Mix 1g of graphite flakes, 0.5g of sodium nitrate and 23ml of concentrated sulfuric acid in an ice bath, slowly add 3g of potassium permanganate while stirring, keep the temperature below 10°C and stir for 1h, then the mixture is heated at 35°C Stir for 0.5h, then add 50ml of deionized water to dilute, release a lot of heat during the process, keep the temperature below 100°C in an ice bath, add 50ml of water, stir the mixture for 0.5h, then add 200ml of deionized water for further dilution. Potassium permanganate was then reduced by adding 10 ml of a 30% by weight aqueous hydrogen peroxide solution. Finally, the mixture was washed and filtered with 5% hydrochloric acid (400ml) to remove metal ions. Then, the acid was removed with 0.5 L of deionized water, and dried at 60 °C for 24 h to obtain graphene oxide.
[0109] Preparation of graphene: Add 0.1g of graphene oxide prepared above into 100ml of water for ultrasonic dispersion (ultrason...
Embodiment 2
[0114] The preparation of graphene oxide is the same as in Example 1.
[0115] Preparation of graphene: Add 0.1g of prepared graphene oxide into 100ml of water for ultrasonic dispersion (ultrasonic frequency 35kHz) for 30min, then add 5ml of hydrazine hydrate (mass concentration is 85%), react in oil bath at 100°C for 24h, and finally obtain The powder obtained after the black flocculent precipitate is washed with water, suction filtered and dried is graphene, and the properties of graphene are shown in Table 2 below.
[0116] Preparation of diurea grease:
[0117] Raw material components: graphene 2kg; 500SN and minus three-line mixed oil: 62.4kg (viscosity of 20mm at 100°C 2 / s); octadecylamine 8.51kg; p-toluidine 3.26kg; TDI 5.51kg; 0.96kg of antioxidant T501; 0.64kg of T406.
[0118] First add 0.5kg of graphene, 8.51kg of octadecylamine and 3.26kg of p-toluidine to 20.4kg of base oil, heat to 80°C to completely melt the organic amine; then add 5.51kg of TDI, 1.5kg of Gr...
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