Marine cylinder oil composite additive

Abstract

The present invention relates to a marine cylinder oil composite additive. Based on the total weight of the composite additive, said marine cylinder oil composite additive comprises: 15-25% sulfonate detergent with superhigh base number, 35-45% phenolate detergent with superhigh base number, 20-30% naphthenate detergent with superhigh base number, 0-8% dispersing agent, 0-4% antiwear agent, and 10-20% Group I base oil with high viscosity index which is selected from the group consisting of 400SN, 500SN and 650SN.

1 . A marine cylinder oil composite additive, wherein, based on the total weight of the composite additive, it comprises: 15-25% sulfonate detergent with superhigh base number, 35-45% phenolate detergent with superhigh base number, 20-30% naphthenate detergent with superhigh base number, 0-8% dispersing agent, 0-4% antiwear agent, and 10-20% Group I base oil with high viscosity index which is selected from the group consisting of 400SN, 500SN and 650SN;
 said sulfonate detergent with superhigh base number is C 22 -C 30  linear alkyl benzene calcium sulphonate, wherein the base number thereof is 395-430 mgKOH/g;   said phenolate detergent with superhigh base number is C 18 -C 24  alkyl sulfurized calcium phenolate, wherein the base number thereof is 290-310 mgKOH/g;   said naphthenate detergent with superhigh base number is C 20 -C 30  long chain alkyl calcium naphthenate, wherein the base number thereof is 390-420 mgKOH/g;   said dispersing agent is selected from the group consisting of mono-polyisobutylene succinimide, bis-polyisobutylene succinimide and multi-polyisobutylene succinimide;   said antiwear agent is zinc long-chain alkyl thiophosphate with the structure corresponding to the following formula,   
       
         
           
           
               
               
           
         
         wherein R 1 , R 2 , R 3  and R 4  are long-chain primary alkyl groups each comprising 12-18 carbon atoms, or R 1 , R 2 , R 3  and R 4  are long-chain secondary alkyl groups each comprising 12-16 carbon atoms. 
       
     
     
         2 . The marine cylinder oil composite additive according to  claim 1 , wherein the kinematic viscosity of said base oil is 8.0-11.0 cst at 100° C.