Composite calcium-base hexa-polyurea lubricating grease and preparation method thereof
A technology of hexapolyurea-based 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. performance, avoid strong volatilization, overcome the effect of poor comprehensive performance
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[0018] The invention provides a preparation method of composite calcium-based hexapolyurea 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 50-80°C ( Preferably 60-75°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 (2.9-3.1):(1.9-2.1):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
[0056] This example is used to illustrate the complex calcium-based hexapolyurea grease of the present invention and its preparation method.
[0057] 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): 24.85g; ethylenediamine: 5.54g; 4,4'-diphenylmethane diisocyanate (purchased from ACROS, MDI): 34.61g; 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.
[0058] 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 mi...
Embodiment 2
[0068] This example is used to illustrate the complex calcium-based hexapolyurea grease of the present invention and its preparation method.
[0069] Composite calcium-based hexaurea grease was prepared according to the method of Example 1, the difference being that terephthalic acid was replaced by isophthalic acid of the same molar amount, thereby preparing composite calcium-based hexapolyurea grease.
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