Preparation process of water-based graphite lubricant for hot-rolled steel pipe core rod

Abstract

The invention discloses a preparation process of a water-based graphite lubricant for a hot-rolled steel pipe core rod. The water-based graphite lubricant for the hot-rolled steel pipe core rod is prepared from the following materials in percentage by weight: 28%-38% of graphite, 4%-5% of lauryl sodium sulfate, 3%-4% of N-acetyl-L-proline, 2%-3% of tributyl phosphate, 0.5%-1% of a thickening agent, 0.5%-1% of an acrylic resin emulsion, 1%-2% of sodium tripolyphosphate, 0.1%-0.15% of an anti-rust agent, 0.1%-0.2% of a preservative, 0.05%-0.1% of a defoaming agent and the balance of water. According to the preparation process of the water-based graphite lubricant for the hot-rolled steel pipe core rod, the lauryl sodium sulfate, the N-acetyl-L-proline and the tributyl phosphate form a dispersing agent, and the lauryl sodium sulfate can improve the steric hindrance effect and the electrostatic repulsion effect among graphite during preparation of a graphite basic solution; and along with the increase of the N-acetyl-L-proline containing the-COOH hydrophilic group, the probability of mutual repulsive force between graphite particles is also improved, and finally, the dispersion stability of the graphite is fully improved through the cooperation of the N-acetyl-L-proline and the graphite particles.

Description

technical field [0001] The invention relates to the field of preparation of water-based graphite lubricants, in particular to a preparation process of water-based graphite lubricants for hot-rolled steel pipe mandrels. Background technique [0002] Hot-rolled steel pipe mandrel is one of the main tools involved in steel pipe rolling deformation. Its material is 4Cr5MoVSi, which belongs to hot work die steel and is a widely used special steel. At present, hot-rolled steel pipe mandrel is in use In an unstable temperature field, it needs to withstand alternating cycles of cold and heat and thermal wear. Therefore, hot-rolled steel pipe mandrels are prone to local cracks and wear, resulting in a serious reduction in their life. The production cost is greatly increased, and at the same time, the quality of the inner surface of the rolled steel pipe is affected. Therefore, in order to reduce the production loss of the hot-rolled steel pipe mandrel, the surface of the hot-rolled s...

AI Technical Summary

Problems solved by technology

[0002] Hot-rolled steel pipe mandrel is one of the main tools involved in steel pipe rolling deformation. Its material is 4Cr5MoVSi, which belongs to hot work die steel and is a widely used special steel. At present, hot-rolled steel pipe mandrel is in use In an unstable temperature field, it needs to withstand alternating cycles of cold and heat and thermal wear. Therefore, hot-rolled steel pipe mandrels are prone to local cracks and wear, resulting in a serious reduction in their life. The production cost is greatly increased, and at the same time, the quality of the inner surface of the rolled steel pipe is affected. Therefore, in order to reduce the production loss of the hot-rolled steel pipe mandrel, the surface of the hot-rolled steel pipe mandrel is usually sprayed with a water-based graphite lubricant before use. Water-based graphite lubricant, also known as "graphite milk", uses a suspending agent to disperse graphite particles in water, and adds other additives to make an emulsion lubricant. The use of water-based graphite lubricant can promote uniform metal deformation, reduce rolling force and The mandrel limits the force, reduces the uneven thickness of the transverse wall of the steel pipe, improves the surface quality of the steel pipe, increases the thermal insulation performance, and reduces the surface temperature of the mandrel, thereby improving the service life of the mandrel and the quality of the steel pipe, but the existing water-based graphite lubricant still exists Some problems are mainly that graphite is easy to form hydrophobic clusters in water, and it is difficult to disperse stably, which has a great impact on the use effect of water-based graphite lubrication. For this reason, this application provides a hot-rolled steel pipe mandrel Water-based graphite lubricant preparation process to effectively solve