Anhydrous calcium-based lubricating grease composition and preparation method thereof

Abstract

The invention relates to an anhydrous calcium-based lubricating grease composition and a preparation method thereof. The composition comprises the following components: 8% to 12% of thickening agent and 88% to 92% of base oil, wherein the thickening agent can be 12-hydroxy calcium stearate, a mixture of the 12-hydroxy calcium stearate and calcium phosphate or the mixture of the 12-hydroxy calcium stearate and hydroxyapatite, wherein the proportion of the 12-hydroxy calcium stearate in the thickening agent is not less than 90% and the proportion of the calcium phosphate and the hydroxyapatite in the thickening agent is not more than 10%. The preparation method comprises the following steps: adding the thickening agent and the base oil which accounts for two third to a hundred percent of the total oil quantity into a reaction kettle; stirring and heating to 150 DEG C to 160 DEG C; continuously stirring and cooling; adding the rest of the base oil at temperature below 120 DEG C; stirring and cooling; expelling oil from the composition three times with a three-roller machine after the temperature is decreased to be below 85 DEG C so as to obtain a finished product; and canning the finished product. The lubricating grease composition provided by the invention has excellent water resistance, oxidation resistance, mechanical stability, colloid stability and abrasion resistance, thereby meeting the requirements of lubricating and protecting mechanical friction parts under humid and washy conditions.

Description

technical field [0001] The invention belongs to the technical field of grease, in particular to an anhydrous calcium-based grease composition and a preparation method. Background technique [0002] Grease is a solid to semi-solid substance in which a thickener is dispersed in the base oil and additives are added to give it certain characteristics. It is mainly used in the mechanical friction part, which can reduce friction and wear. It has other functions such as sealing and anti-corrosion. Ordinary calcium-based grease with water as stabilizer in its own structure has a dropping point of less than 100°C and can only be used in the temperature range below 60-65°C. Anhydrous calcium-based grease does not have structural water, the dropping point is greater than 140 °C, and the short-term use temperature can reach 120 °C. Anhydrous calcium-based grease has good anti-oxidation ability, water resistance, mechanical stability and colloidal stability, accounting for about 3% of ...

AI Technical Summary

Problems solved by technology

There are few technical literature reports and patents about anhydrous calcium-based grease at home and abroad. A kind of anhydrous calcium-based grease and its preparation method are disclosed in CN102755847. Since the saponification and drainage process is easy to overflow the kettle, there is a greater safety risk. Hidden dangers, and the post-processing process is complicated, and the process stability of the production process is poor

Food machinery lubricating grease and its manufacturing method are disclosed in CN1113940A. Due to the selection of food-grade raw materials, the production cost is high, the scope of application is limited, and the performance of the product is relatively poor

RU2163628C1 discloses a method for preparing calcium-based lubricating grease. The 20-carbon fatty acid first needs to be oxidized at high temperature in the air. The process is complicated and costly, and the mechanical stability and colloidal stability of the product are also uncertain.

GB1036684A discloses a kind of lubricating grease, the additive contains lead, due to the requirements of environmental protection, the lead-containing additive has been eliminated, and the plant acid in the raw material is an unsaturated acid, and the oxidation resistance is poor

The anhydrous calcium-based lubricating grease disclosed in US2847381 has complex raw materials and requires pretreatment. The lubricating grease has no post-treatment process, and the appearance of the product is rough, the particles are large, and the colloidal stability is poor

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