Preparation method for environment-friendly extreme-pressure cutting oil

Abstract

The invention relates to a preparation method for environment-friendly extreme-pressure cutting oil. According to the invention, modified rape-seed oil is used for replacing mineral oil as base oil and replacing animal and plant oil as an oily agent for the extreme-pressure cutting oil, so the viscosity of the cutting oil is lowered, the flash point of the cutting oil is increased and oil smoke produced during metal cutting is reduced; since the modified rape-seed oil is used as the base oil, the occupancy volume of the oily agent is increased and lubricity of the cutting oil is substantially improved; a combination of the modified rape-seed oil and a small amount of phosphate ester can replace a conventional extreme-pressure agent, i.e., chlorinated paraffin; and after addition of a part of an extreme-pressure additive containing active sulfur, the extreme-pressure lubricity of the extreme-pressure cutting oil provided by the invention can reach the level of frequently used extreme-pressure cutting oil containing sulfur, phosphorus and chlorine extreme-pressure agent in the prior art. The extreme-pressure cutting oil provided by the invention is biodegradable due to usage of the modified rape-seed oil as the base oil, does not contain the chlorinated paraffin extreme-pressure agent posing great pollution to the environment, has low viscosity and a high flash point, reduces smog pollution produced by cutting oil; and the extreme-pressure cutting oil is endowed with antioxidation performance and prolonged in an oil change period, and is environment-friendly.

Description

technical field [0001] The invention relates to a metal cutting oil, in particular to a preparation method of an environment-friendly extreme pressure cutting oil. Background technique [0002] Extreme pressure cutting oil is based on mineral oil and added with oily additives and extreme pressure additives. It has good extreme pressure lubricity and can meet the harsh processes of cutting, broaching and tapping of stainless steel, heat-resistant alloys and other difficult-to-cut materials. Cutting oil required for machining cooling and lubrication. At present, the extreme pressure cutting oils used in the machinery industry generally have the following three problems: First, the current extreme pressure cutting oils generally use chlorinated paraffin as one of the extreme pressure additives of extreme pressure cutting oils. Chlorinated paraffin is very successful in extreme pressure cutting due to its good extreme pressure performance and low price. In recent years, intern...

AI Technical Summary

Problems solved by technology

According to relevant literature reports, when burning waste cutting oil containing chlorinated paraffin, highly toxic dioxins will be generated, which will seriously pollute the environment

In recent years, more and more mechanical processing enterprises in my country have specified that they do not use cutting oils containing chlorides when purchasing metal processing oils; second, the oily additives used in many extreme pressure cutting oils are vegetable oils, and these oils are Contains an unsaturated and healthy chemical structure, which is easy to oxidize and deteriorate, resulting in an increase in the acid value of the cutting oil, producing jelly, clogging the filter, rusting and yellow robes on the machine tool parts, affecting the machining accuracy and efficiency of the machine tool, and shortening the life of the cutting oil. Service life; 3. Mineral oil is currently used as the base oil for extreme pressure cutting oil. Mineral oil cannot be biodegraded, and it is troublesome to treat waste oil. At the same time, when preparing low-viscosity extreme-pressure cutting oil, use the flash point of low-viscosity mineral oil Low, large oil fumes during cutting, and greater pollution to the processing environment