Synthesis And Application Of Hydrogenated Cardanol Polyoxyethylene Ether-16 Cationic Surfactants

Cardanol is extracted from the oil of natural cashew shell. It is a kind of phenolic compounds which is a renewable resource and has wide distribution.Its price is low. Cardanol can replace a variety of phenolic fine petrochemical raw materials in the process of chemical synthesis. At present, people usually apply it in phenolic resin and epoxy resin. However, it is not widely used in the application of surfactant.This paper takes cardanol as raw material to manufacture hydrogenated cardanol polyoxyethylene ether-16 cationic surfactants (EY-4).With the peculiar bactericidal performance of the cationic surfactants, it can sterilize and descale to the reverse osmosis membrane.Firstly, taking cardanol as raw material, by addition reaction of ethylene oxide, cardanol polyoxyethylene ether (EY-1) is synthesized whose ethylene oxide adduct number is 16 at 135～140℃ and under 2×105～3×105Pa, and then with aluminum nickel alloy as catalyst and anhydrous ethanol as solvent, catalytic hydrogenation reacts under normal temperature and pressure. The saturated cardanol polyoxyethyle-neether is (EY-2) synthesized, and then it reacts with the sodium metal at 90℃ in the oil bath, EY-3 is obtained. Finally, EY-3 reacts with cycocel, after being purified, EY-4 is made. By associating with anionic surfactant and characterizing FT-IR,1H-NMR, the result shows the synthesis is the target products;Secondly, the effects of the amount of catalyst, the variety of solvent and reaction time on the hydrogenation rate are inspected in the process of experiment to determine the optimum conditions for synthesizing EY-2. Considering the influence of the ratio of the raw material and reaction temperature to the reaction rate of sodium, the optimum conditions for synthesis of EY-3 is determined. Considering the effects of the ratio of raw materials and reaction time on the reaction rate, the optimum condition for synthesis of EY-4 is determined. Finally the product is purified.Thirdly, The HLB value and cloud point of EY-1 and EY-2 are determined, and the softening point of EY-1 and EY-4 and critical micelle concentration of EY-4 are also determined. The results show that the HLB value increases and cloud point and softening point rise. When the critical micelle concentration of EY-4 is 0.0016, EY-4 has bactericidal performance.Finally, DF-15 Reverse osmosis membrane scale inhibitor dispersing agent can be made by compounding EY-4 with RX-1. Testing its bactericidal properties, the results show that:when the concentration of the EY-4 is 10mg/L and the concentration of RX-1 is 20mg/L, the rate of sterilization can reach 100%. Comparing DF-15 with RX-1 in the aspect of pressure, electric conductivity and water production rate. It proves that DF-15 has good bactericidal inhibition properties...