Composite calcium-base octa-polyurea lubricating grease and preparation method thereof
A technology of octa-based polyurea grease and complex calcium-based grease, applied in lubricating compositions, petroleum industry, thickeners, etc., can solve the problems of poor comprehensive performance of calcium-based polyurea grease, and achieve excellent comprehensive performance, avoid strong volatilization, the effect of excellent comprehensive performance
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[0018] The invention provides a preparation method of composite calcium-based octapolyurea grease, the method comprising the following steps:
[0019] (1) In the presence of lubricating base oil, contact reaction of calcium hydroxide, higher fatty acid, dibasic aromatic acid and C1-C6 fatty acid, heat up and dehydrate the mixture obtained after the reaction, and then cool down to 50-70°C ( Preferably 50-60°C), to obtain complex calcium-based grease;
[0020] (2) Add diisocyanate, diamine and monoamine to the complex calcium-based grease, carry out a contact reaction at 80-120°C, and heat up the mixture obtained after the reaction to refine, wherein, diisocyanate, diamine The molar ratio with the amount of monoamine is (3.9-4.1):(2.9-3.1):2.
[0021] In step (1), the conditions for the contact reaction of calcium hydroxide, higher fatty acid and dibasic aromatic acid may include: the reaction temperature is 80-90° C., and the reaction time is 10-60 minutes.
[0022] In one em...
Embodiment 1
[0055] This example is used to illustrate the preparation method of the complex calcium-based octapolyurea grease of the present invention.
[0056] Raw material components: HVI500SN base oil (purchased from ExxonMobil Chemical Company, viscosity at 100°C is 11mm 2 / s): 862.5g; octadecylamine (purchased from ACROS): 20.39g; ethylenediamine: 6.81g; 4,4'-diphenylmethane diisocyanate (purchased from ACROS, MDI): 37.80g; Terephthalic acid: 29.05g; Acetic acid: 5.25g; Ca(OH) 2 : 19.11g; 12-hydroxystearic acid (purchased from Tongliao Weining Chemical Co., Ltd.): 23.7g; tungsten disulfide: 7.5g; selenium disulfide: 12.5g; fluorinated graphite: 12.5g; Diphenylamine: 7.5g; Zinc naphthenate: 12.5g;
[0057] Mix 500g of HVI500SN base oil with 23.7g of 12-hydroxystearic acid, 29.05g of terephthalic acid and 5.25g of acetic acid, stir evenly, raise the temperature to 80°C, add dropwise lime milk solution containing 19.11g of calcium hydroxide, Stir rapidly for saponification for 60 min...
Embodiment 2
[0067] This example is used to illustrate the preparation method of the complex calcium-based octapolyurea grease of the present invention.
[0068] Composite calcium-based octapolyurea grease was prepared according to the method of Example 1, except that terephthalic acid was replaced with isophthalic acid of the same molar amount, thereby preparing composite calcium-based octapolyurea grease.
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