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Complex-calcium-based tetrapolyurea lubricating grease and preparation method thereof

A technology of calcium-based tetrapolyurea grease and lubricating base oil, which is applied in the direction of lubricating compositions, petroleum industry, thickeners, etc., can solve the problems of poor comprehensive performance of calcium-based polyurea grease, and avoid small molecules Strong acid volatilization, overcoming poor comprehensive performance and excellent comprehensive performance

Active Publication Date: 2013-08-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the hardening problem that complex calcium base grease exists, those skilled in the art try to introduce polyurea grease in complex calcium base grease, for example, CN1364859A and CN1657599A disclose respectively by introducing dipolyurea in complex calcium base grease And the obtained calcium-based polyurea grease, however, the overall performance of these calcium-based polyurea greases is not good

Method used

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  • Complex-calcium-based tetrapolyurea lubricating grease and preparation method thereof
  • Complex-calcium-based tetrapolyurea lubricating grease and preparation method thereof
  • Complex-calcium-based tetrapolyurea lubricating grease and preparation method thereof

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preparation example Construction

[0018] The invention provides a preparation method of composite calcium-based tetrapolyurea 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 70-80°C), to obtain complex calcium-based grease;

[0020] (2) Add diisocyanate and diamine in sequence to the complex calcium-based grease, add monoamine after mixing and contacting for at least 5 minutes, heat up to 90-120°C (preferably 100-120°C) for contact reaction, and The mixture obtained after the reaction is heated and refined, wherein the molar ratio of diisocyanate, diamine and monoamine is (1.9-2.1): 1: (1.9-2.1).

[0021] According to the method of the present invention, in step (1), the lubricating grease obtained after dehydration is cooled to 50-80° C., and in st...

Embodiment 1

[0056] This example is used to illustrate the complex calcium-based tetrapolyurea 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): 31.87g; ethylenediamine: 3.56g; 4,4'-diphenylmethane diisocyanate (MDI): 29.57g; 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, Quickly stir and saponify for 60 minutes, raise the temperatur...

Embodiment 2

[0068] This example is used to illustrate the complex calcium-based tetrapolyurea grease of the present invention and its preparation method.

[0069] Composite calcium-based tetrapolyurea grease was prepared according to the method of Example 1, except that terephthalic acid was replaced with the same molar amount of isophthalic acid to obtain composite calcium-based tetrapolyurea grease.

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Abstract

The invention relates to a complex-calcium-based tetrapolyurea lubricating grease and a preparation method thereof. The preparation method comprises the steps that: (1) under the existence of a lubricating base oil, calcium hydroxide, higher fatty acid, binary aromatic acid, and C1-C6 fatty acid are subjected to contact reaction; a mixture obtained after the reaction is subjected to heating dehydration, and is cooled to 50-80 DEG C, such that complex-calcium-based lubricating grease is obtained; (2) diisocyanate and diamine are sequentially added into the complex-calcium-based lubricating grease, and mixed contact is allowed for at least 5min; monoamine is added, and the mixture is heated to 90-120 DEG C, such that contact reaction is carried out; and a mixture obtained after the reaction is heated and refined. A dose molar ratio of diisocyanate to diamine to monoamine is (1.9-2.1):1:(1.9-2.1). The complex-calcium-based tetrapolyurea lubricating grease provided by the invention has excellent comprehensive performance.

Description

technical field [0001] The invention relates to a method for preparing composite calcium-based tetrapolyurea grease and the composite calcium-based tetrapolyurea grease prepared by the method. Background technique [0002] Polyurea grease (referred to as polyurea grease) is a grease prepared by thickening base oil with organic compounds containing urea groups in the molecule. Since the polyurea thickener is different from the metal soap-based thickener, it does not contain metal ions, which avoids the catalytic oxidation of the metal ions in the soap-based thickener to the grease base oil, so the polyurea grease has good oxidation stability. Excellent performance and thermal stability, making polyurea grease more suitable for lubrication under high temperature conditions. [0003] At present, the reports of articles and patents mainly focus on the preparation and synthesis of dipolyurea grease. The shear stability of dipolyurea grease is poor, and the difference between 100...

Claims

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Application Information

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IPC IPC(8): C10M123/02C10M177/00
Inventor 孙洪伟王佳何懿峰刘磊翟浩川段庆华刘中其姜靓
Owner CHINA PETROLEUM & CHEM CORP
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