Composite quaternary ammonium salt disinfectant and method for preparing the same

A composite quaternary ammonium salt disinfectant, wherein the raw materials thereof comprise:

• a double long-chain quaternary ammonium salt, two single long-chain quaternary ammonium salts, a synergist isothiazolinone, a nonionic surfactant fatty alcohol polyoxyethylene ether, and water;
• the double long-chain quaternary ammonium salt is one or more selected from the group consisting of didecyl dimethyl ammonium chloride, dioctyl dimethyl ammonium chloride, and octyl decyl dimethyl ammonium chloride;
• the two single long-chain quaternary ammonium salts are alkyl dimethyl benzyl ammonium chloride with an alkyl chain length of C12-C16 or dodecyl dimethyl benzyl ammonium chloride;
• and alkyl dimethyl (ethylbenzyl) ammonium chloride with an alkyl chain length of C12-C14, respectively;
• the synergist isothiazolinone is one or more selected from the group consisting of 2-methyl-4-isothiazolin-3-one, 2-octyl-4-isothiazolin-3-one, 1,2-benzisothiazolin-3-one, and a mixture of 2-methyl-5-chloro-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one in a mass ratio of 3:1;
• the fatty alcohol polyoxyethylene ether is C12-C14 fatty alcohol polyoxyethylene (9) ether;
• the total concentration of the double long-chain quaternary ammonium salt and the two single long-chain quaternary ammonium salts in the composite quaternary ammonium salt disinfectant ranges from 2.0 g/L to 200 g/L (w/v);
• the mass ratio of the double long-chain quaternary ammonium salt to the two single long-chain quaternary ammonium salts is 1:0.20-1.0:0.20-1.0;
• the content of the synergist ranges from 0.01% to 1.0% (w/w);
• and
• the content of the nonionic surfactant ranges from 1.0% to 20% (w/w).