Synthesis Of M-pentadecylphenol Polyoxyethylene Ether And Its Application In Metal Cleaning

Water-soluble metal cleaning agents currently mostly use nonylphenol polyoxyethylene ether as the main component,but nonylphenol polyoxyethylene ether has been limited in use due to environmental protection and other problems.With cardanol as raw material,cardanol polyoxyethylene ether can be obtained after reaction with ethylene oxide,which is expected to become a substitute for nonylphenol polyoxyethylene ether.However,the hydrocarbon group of cardanol polyoxyethylene ether contains 0 to 4 double bonds.The product is actually a mixture.Its product quality is affected by raw materials and preparation methods.Its performance is difficult to control.At the same time,the presence of double bonds makes it difficult to be used in acidic systems.Use,application is limited.This paper proposes to hydrogenate the above mixture to obtain a relatively pure single compound,namely m-pentadecylphenol polyoxyethylene ether(DE),in the hope of solving the above problems.In addition,among the DE compounds,compounds with epoxy numbers of 8 and 17 have not been synthesized.Firstly,the reaction was carried out at 135～140℃ and 2×105～3×105 Pa.The addition reaction of cardanol and ethylene oxide was carried out at a certain molar ratio to synthesize the addition number of 8 and 17 respectively.P-pentadecylphenol ethoxylates UDE-8 and UDE-17.The above products were catalytically hydrogenated using a platinum carbon catalyst to prepare the pentadecylphenol ethoxylate nonionic surfactants DE-8 and DE-17.The effects of catalyst dosage,reaction temperature and reaction time on the catalytic hydrogenation reaction were investigated by single factor experiments.The optimal reaction conditions for the catalytic hydrogenation experiments were finally determined.Secondly,the product was characterized by FT-IR and 1H-NMR,which proved it to be the target product.The HLB value,critical micelle concentration,softening point and cloud point number of the above products were determined.Thirdly,the kinetic experiments were carried out on the catalytic hydrogenation reaction.The concentration of the reactants at 288.15～303.15 K was measured with the change of reaction time.The activation energy of the two-step reaction was obtained by fitting,which was 92.79 KJ/mol and 101.98 KJ/mol,both between 40～400 KJ/mol,is a chemical reaction control step.The kinetic model of catalytic hydrogenation reaction was established,and its reliability was verified.The kinetic equation of catalytic hydrogenation reaction was determined.Lastly,DE and other additives were compounded.Through orthogonal design experiments and industrial experiments,the optimal formulation and cleaning process of aluminum and its alloys and stainless steel and carbon steel cleaning agents were determined.Experiments show that DE can be used in metal cleaning,with good stability and cleaning effect in both neutral and acidic environments,in line with national cleaning standards;cleaning process is easy to operate,can be used twice,and can be applied to industrial cleaning.