Grease used specially for sintering machine in metallurgical industry and preparation method thereof

Abstract

The invention discloses grease used specially for a sintering machine in a metallurgical industry and a preparation method thereof. The grease used specially for a sintering machine comprises: by weight, 3 to 6% of octadecylamine, 2 to 5% of aniline, 1 to 3% of ethanediamine, 2 to 3% of diphenylmethane-4,4'-diisocyanate (MDI), 50 to 70% of base oil A, 20 to 30% of base oil B, 0.5 to 1% of an antioxidant A, 2 to 4% of an antioxidant B, 1 to 2% of a rust inhibitor A, 2 to 3% of a rust inhibitor B, 2 to 5% of an extreme-pressure anti-wear agent A, 2 to 4% of an extreme-pressure anti-wear agent B, and 10 to 20% of a tackifier. In preparation, the raw materials are mixed by stirring in a certain order according to different temperatures and then are treated by related processes. The grease used specially for a sintering machine overcomes defects of the existing grease and is suitable for lubrication of bearings at different positions of an elastic slide of a large-scale sintering machine in a metallurgical industry and for lubrication of other high-temperature devices such as a soaking pit furnace, an annealing furnace and a drying furnace.

Description

technical field [0001] The invention relates to the field of lubricating grease, in particular to a lubricating grease specially used for sintering machines in the metallurgical industry and a preparation method thereof. Background technique [0002] The sintering operation of the sintering machine has a long production process and complicated equipment. In addition, it is in special working conditions such as high temperature, dusty, heavy load and acid gas environment, which makes the requirements for the grease quite strict. The sintering operation of the sintering machine is realized by high negative pressure operation. The air sealing sheet of the sintering machine has its own weight and elasticity. Under the action of pressure, it will wear and deform due to sliding, resulting in gaps on the contact surface, resulting in air leakage. This phenomenon is not only related to the mechanical structure, but also related to the temperature of the sintered ore during the sinte...

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Problems solved by technology

The abnormal wear of the sealing part will be accelerated due to the softening of grease at high temperature, poor grease supply caused by outflow and grease supply failure, and poor sealing caused by dust mixing.

[0003] The lubricating grease used in the sealing device of the sintering machine is generally supplied through an automatic grease supply device. At present, quite a few metallurgical enterprises use traditional soap-based lubricating grease, but this kind of lubricating grease has poor high temperature performance, is easy to soften and lose, and produces gaps on the contact surface. The pressure difference causes the sealing structure formed by the grease to be damaged, air leakage occurs, and wear is accelerated, which fails to meet the requirements of lubrication and sealing. Moreover, the soap-based grease contains metal ions, which is easy to coke and block the pipeline at high temperature, and has poor pumpability.

Therefore, in the process of use, it is found that poor lubrication causes large air leakage rate, serious slideway wear, and low production efficiency. According to reports, the maximum air leakage rate of foreign sintering machines does not exceed 30%, while the air leakage rate of currently operating sintering machines in China is generally 40- 60%, in addition to improving the equipment, it is also necessary to strengthen the improvement of the performance of the lubricating grease

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