Abrasion resistant extreme-pressure additive of borate and preparation method thereof

The invention relates to borate antiwear and extreme pressure additive and a preparation method thereof. The additive mainly comprises oil media, dispersant and macromolecule polymerization borate, and the weight percentage is as follows: 10 to 50 percent of oil media, 1-5 percent of dispersant and 50 to 90 percent of macromolecule polymerization borate; the oil media is the mixture of mineral base oil, synthetic base oil, mineral oil and synthetic oil; the dispersant adopts C12-C22 fatty acid metallic soap or C12-C22 hydroxyl fatty acid metallic soap; the preparation method is, firstly, according to the molar ratio of 1:1 to 0.2:1, caustic potash and boric acid are added in a certain amount of water in sequence, and heated to 70 to 90 DEG C and react for a certain time; secondly, one or several types of the above base oil is added, and heated to 100 to 200 DEG C, the water is evaporated, and then heated to 200 to 230 DEG C, and polymerization reaction lasts for 0.5 to 1h; thirdly, the mixture is cooled down to approximate 180 DEG C, one or several types of the above dispersant is added, and continuously cooled down to approximate 110 DEG C, took out of the reaction vessel, homogenized under high pressure with a homogenization pump, and the finished product is obtained; the invention has the advantages that the technology is simple; the operation is easy; the water resistance is good; the steadiness is good; the antiwear and extreme pressure property is excellent; and the application range of the borate is widened.