Environmentally friendly metal cutting oil with high load-bearing and high anti-wear properties

Abstract

An environmentally friendly metal cutting oil with high load-bearing and high wear resistance, belonging to the technical field of metal cutting fluids. The cutting fluid is composed of diisooctyl sebacate, phosphate amine salt extreme pressure additives, borate series additives and sulfurized extreme pressure additives, the sulfurized extreme pressure additives are sulfurized fatty acid esters and dialkyl pentasulfide (Rc2540). The load-bearing capacity (Pb) of the cutting oil can reach more than 920N, and the low-load long-wear wear spot diameter (Db) can be less than 0.35 mm.

What is claimed is: 
     
         1 . An environmentally friendly metal cutting oil with high load-bearing and high anti-wear performance, characterized in that the cutting oil is composed of a base oil, a phosphate amine salt extreme pressure additive, a borate additive and a sulfurized extreme pressure additive, wherein the sulfurized extreme pressure additive is a sulfurized fatty acid ester and a dialkyl pentasulfide Rc2540, and wherein the base oil is diisooctyl sebacate. 
     
     
         2 . The environmentally friendly metal cutting oil with high load-bearing and high anti-wear performance according to  claim 1 , characterized in that: the weight % of the phosphate amine salt extreme pressure additive is 0.12-0.80% of the weight of the base oil; the weight % of the borate additive is 0.05-1.60% of the weight of the base oil, the weight % of the sulfurized fatty acid ester is 0.10-0.85% of the weight of the base oil, and the weight % of the dialkyl pentasulfide Rc2540 is 0.20-0.85% of the weight of the base oil. 
     
     
         3 . The environmentally friendly metal cutting fluid with high load-bearing and high anti-wear performance according to  claim 2 , characterized in that the weight ratio of the sulfurized fatty acid ester to the dialkyl pentasulfide Rc2540 is in the range of 0.23 to 5. 
     
     
         4 . The environmentally friendly metal cutting oil with high load-bearing and high anti-wear performance according to  claim 3 , characterized in that the weight ratio of the phosphate amine salt extreme pressure additive to the borate additive is greater than 0.2. 
     
     
         5 . The environmentally friendly metal cutting oil with high load-bearing and high anti-wear performance according to  claim 1 , characterized in that the borate additive is octadecyloxy sulfonated nano calcium borate T365. 
     
     
         6 . The environmentally friendly metal cutting oil with high load-bearing and high anti-wear performance according to  claim 1 , characterized in that: the phosphate amine salt extreme pressure additive is a fatty cluster phosphate amine salt T6150, and the fatty cluster phosphate amine salt T6150 is a mixture of a class of phosphate amine salts, and its general structural formula is as shown in formula (1): 
       
         
           
           
               
               
           
         
         wherein, in formula (1), R is a C1-C4 aliphatic alkyl group, and NH2R′ is a C12-C14 fatty alkyl primary amine. 
       
     
     
         7 . The environmentally friendly metal cutting oil with high load-bearing and high wear resistance according to  claim 1 , characterized in that: the formula of the cutting oil is: the addition amount of the phosphate amine salt extreme pressure additive, borate additive, sulfurized fatty acid ester and dialkyl pentasulfide Rc2540 is 0.60-0.80%, 0.20-0.35%, 0.02-0.10% and 0.65-0.78% of the base oil weight, respectively, or the addition amount of the phosphate amine salt extreme pressure additive, borate additive, sulfurized fatty acid ester and dialkyl pentasulfide Rc2540 is 0.25-0.42%, 1.2-1.65%, 0.50-0.75%, 0.03-0.15% of the base oil weight, respectively; the load-bearing capacity Pb of the cutting oil of said formula is greater than or equal to 920N, and the low-load long-wear wear spot diameter Db is less than 0.35 mm at a load F=294N and a loading time T-60 min. 
     
     
         8 . The environmentally friendly metal cutting oil with high load-bearing and high anti-wear performance according to  claim 1 , characterized in that the preparation process of the environmentally friendly cutting oil is as follows: adding phosphate amine salt extreme pressure additives, borate additives and sulfurized extreme pressure additives to the base oil in proportion, stirring evenly, and heating at 75-100° C. for 30-60 minutes to obtain the environmentally friendly cutting oil.