A kind of preparation method of imidazoline amphoteric surfactant

Abstract

The invention provides a kind of preparation method of imidazoline amphoteric surfactant, it is characterized in that: comprise the following steps, (1) add coconut oil, diethylenetriamine, water-carrying agent, catalyzer to be equipped with water separator and high In the reactor of the vacuum protection device, the dehydration reaction was carried out at 120-150°C for 4-5h, then the temperature was raised to 200-230°C, the dehydration reaction was carried out for 4-6h, and the water-carrying agent and unreacted diethylenetriamine were evaporated, and the acid was measured valence is less than 1, and the reaction is completed to obtain the imidazoline intermediate; (2) at room temperature, add the sodium chloroacetate aqueous solution dropwise to the imidazoline intermediate in 3-6 times, and add dropwise while stirring; (3) divide after adding Add sodium hydroxide solution step by step; (4) After adding the alkali, keep the temperature at 60-80°C for 2-8h; (5) heat up to 80-100°C and continue the reaction for 2-8 hours to obtain the imidazoline surfactant. The product prepared by the invention has good stability, good water solubility, long storage time at low temperature and good transparency, and is very suitable for making transparent products.

Description

technical field [0001] The invention belongs to the technical field of mild imidazoline quaternary ammonium salts, and in particular relates to a preparation method of an imidazoline amphoteric surfactant. Background technique [0002] Disodium Cocoamphodiacetate is an imidazoline type amphoteric surfactant. Amphoteric surfactants contain both anionic and cationic groups, and can carry different ionic charges in different pH ranges. Therefore, amphoteric surfactants have many excellent properties, not only have particularly low toxicity, irritation to the skin and eyes, and good biodegradability, but also have excellent decontamination, foaming, emulsification, wetting, hard water resistance, Acid and alkali resistance, relatively stable to various metal ions, good compatibility with other ionic surfactants, and good antistatic, sterilization, disinfection and anti-corrosion properties, not only has broad application prospects in the daily chemical industry, but also It is...

AI Technical Summary

Problems solved by technology

Now there are many units producing disodium cocoyl diacetate in the country, but the common problem is that the product is not stable, the storage time is short under low temperature conditions, and it is easy to turbid, which brings a lot of inconvenience to customers who make transparent products; The problem of product instability and poor transparency at low temperature has also become a difficulty in the industry, and many professional and technical personnel are actively exploring and researching

However, effective solutions to this problem have not been reported yet, and how to solve these problems has become an urgent problem to be solved in this field.